Rotational state modification and fast ortho-para conversion of H2 trapped within the highly anisotropic potential of Pd(210)

S. Ohno, D. Ivanov, S. Ogura, M. Wilde, E. F. Arguelles, W. A. Diño, H. Kasai, and K. Fukutani
Phys. Rev. B 97, 085436 – Published 26 February 2018
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Abstract

The rotational state and ortho-para conversion of H2 on a Pd(210) surface is investigated with rotational-state-selective temperature-programmed desorption (RS-TPD) and theoretical calculations. The isotope dependence of TPD shows a higher desorption energy for D2 than that for H2, which is ascribed to the rotational and zero-point vibrational energies. The RS-TPD data show that the desorption energy of H2(J=1) (J: rotational quantum number) is higher than that of H2(J=0). This is due to the orientationally anisotropic potential confining the adsorbed H2, which is in agreement with theoretical calculations. Furthermore, the H2 desorption intensity ratio in J=1 and J=0 indicates fast ortho-para conversion in the adsorption state, which we estimate to be of the order of 1 s.

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  • Received 18 October 2017
  • Revised 27 December 2017

DOI:https://doi.org/10.1103/PhysRevB.97.085436

©2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

S. Ohno1, D. Ivanov1, S. Ogura1, M. Wilde1, E. F. Arguelles2, W. A. Diño2,3, H. Kasai4, and K. Fukutani1,*

  • 1Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo, 153-8505, Japan
  • 2Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
  • 3Center for Atomic and Molecular Technologies, Osaka University, Suita, Osaka 565-0871, Japan
  • 4National Institute of Technology, Akashi, Nishioka, Uozumi-cho, Akashi, Hyogo 674-8501, Japan

  • *fukutani@iis.u-tokyo.ac.jp

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Issue

Vol. 97, Iss. 8 — 15 February 2018

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